The A.G
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I don’t quite understand the solution in the ms, what I have done is find the gradient of the perpendicular line which is sin(theta)/cos(theta) and then negative reciprocal to find the line RP which gives -cotName:  4A642550-4260-430E-85DE-283DAA65E5F9.png
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Muttley79
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(Original post by The A.G)
I don’t quite understand the solution in the ms, what I have done is find the gradient of the perpendicular line which is sin(theta)/cos(theta) and then negative reciprocal to find the line RP which gives -cot
Check your diagram - have you marked theta correctly? A quick look suggests it is 90 - theta
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The A.G
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(Original post by Muttley79)
Check your diagram - have you marked theta correctly? A quick look suggests it is 90 - theta
My bad, you’re right.

How would deduce that it’s 90-theta quickly.I used quadrilateral, or similar triangles but both takes long in my opinion
Last edited by The A.G; 1 month ago
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Muttley79
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(Original post by The A.G)
My bad, you’re right.

How would deduce that it’s 90-theta quickly.I used quadrilateral, or similar triangles but both takes long in my opinion
If you draw the line from Q to the x-axis it's clearer
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